Pump for liquid-gears.



H.LENEZ. PUMP POB. LIQUID GEABS. Y yAPPLIOATIUN FILED Nov. 21, 1911.

1,054,574; Patented Feb.25,1 913.

2 SHEETS-SHEET 1.

WITN Ess E5 y INVENToR Huso LENT-z EAY ATTORNEY y H. LBNTZ, PUMP `FR LIQUID GIEABS.` APPLIUATION FILED NOV'. 21, 1911.

-zg 'K l2 3 L y o, VE L j? l fya d@ E315 INVENToR HUGO LEN-rz ATTORNEY Patented Feb. 25, 1913.

, or smaller blade throw Grunewald, near Berlin, 4 vented a new and useful Improvement 1nl HUGO LENTZ, OFlGRUNEWALD, NEAR BERLIN, GERMANY.

PUMP ron. LIQUID-cunas.

To all whom it may concern Be it known that I, HUGO LENTZ, a sub-- ject of the German Emperor, residing at Germanyhave 1n- Pumps for Liquid-Gears; and I do hereby declare the following to be a full, clear, and exact description of the same.

fIn liquid gears for power vehicles which work upon the principle of piston blades slidable in radial recesses in rotatable drums and movable in said recesses by means of projections engaging in `cam"slots, it hasl hitherto been impossible to effect,- speedily a-nd with certainty, changes. in the transmission conditions by changing the set-s of plstons of the gear. Formerly in such cases 1t was necessaryv to remove successively the piston, the cams, the ball-bearings, etc., and then to insert the new parts in similar fashion, so that a tedious task consuming hours was necessary before the actual driving could again take place. A change in the transmission conditions could therefore only be effected with great diiiculty, even taking into consideration the fact that, as is wellknown, the liquidv gear is disposed horizontally in the chassis of the vehicle, so that the removal of the separate parts from the casing is very inconvenient. But the easyalteration of the transmission conditions (i. e., substitution of a different set of pistons, the pistons of which have for example, a greater or breadth `differing from the original set, whereby with the same number of revolutions of the power motor the -deliv'ery andtherefo're the speed is ditferent) is 'in motor vehicles of the very greatest importance, because correct transmission conditions under which the motor is used tothe best advantage under all circumstances can only be discovered by time andby experiment.

'By-the subject matter of the present invention it is made possible toremove all iIv one the set of pistons tobe changed and just ,as quickly to insert the substituted set.

Thevinvention consists of the fact that the valveless pump with all appurtenant parts is built ready'vfor use in a pipe-like'shell, or sleeve which; together with the ent-ire 4set can be immediatelyexchanged for another.- Therefore the very ent-rails, as it were, of the liquid gear can be changed as a whole, which was 1 formerly impossible, but which is most desirable upon the breaking of any ASpecification of Letters Patent. Application led November 21, 1911.

Patented Feb. 2 5, wie. serial No. 651.524.

part. It also avoids thediliculty of mountmg the parts can be easily mounted in the pipelike sleeve or shell in the work shop, and then the whole can be inserted in the vehiele. The abutments in the pump, which formerly were fastened by screws passing through the casing, can now be fastened to the pipe-like Sleeve, so that the casing need noL longer be pierced, whereby'the loss of thev parts inside the casingfsince now l` @oil which took placev at high pressures` through the riveted screw holes is avoided. With pipe-like sleeves of a plurality of parts one is in a position 'to change single ready mounted parts.' The substltute parts no longer need first to be inserted in the vehicle, they can be previously inserted in the pipe-like sleeve in the work shop, and in the vehicle can be inserted an already .mounted set, so that the vehiclecan at'once commence its journey under the best conditions.

One form of carrying'outI the invention is shown in the drawing, in which a plurality of pressure pumps 1s adopted.v

Figure l shows insect-ion a-casin of a liquid gear for power vehicles,` fitte with the new device. Figfla shows a transverse section taken on the line 1a- 1a of F1g. l. Fig. 2 shows in similar fashion an arrangement in which` the pipe-like sleeve consists of two parts. Fig. 3, also vin section, shows a setl of pumps consisting of two divisions ready to be built into the casing. Figs. 4

to 7 show fra mental sections of separate forms ofthe plpe-like sleeve.

The new arrangement consists of a pipev groovesfl in the vcam 'pieces d, e serve to move the vanes in radial direct-ion. the vanes, upon rotation of the pistons being forced .to advance and withdraw radiall)v by means of the projections engaging in said grooves. The pipe-like she-ll or sleeve a can now1be`connected with the cover j of the pump casing by screws j so that it can be withdrawn from the casing Z by means of the cover j, or the sleeve a can (see Fig. 4) .be att-ached by means of `small screws to 5the'twov outer parts of the set of pumps u(cam-piece d and rear cover la). Further the sleeve a. (see' Fig. 5) can bev provided with a perforated riliio', by which it may be removably bolted to the casing, so that itv can be Withdrawn from the casing independent of t-he coverv j.

The sleeve a need not consist of one piece, but can if necessary be formed of several pieces. In Figs. 2 and 8 an arrangement is shown in which 2 sleeve parts m n are employed. In Fig. 3 the shaft o passes through the rear cover k and terminates in a screw boltl p, the nut g of which rests, by means of a collar on the ball-bearing in the cover k. In this arrangement a pull on the shaft o is all that is necessary to draw the entire set of pumps from t-he casing. The tivo sleeve parts m and n', (Fig. 6) and m2 n2, (Fig. 7) can also be provided with rims r', and they can have different diameters as the parts m n Fig. 6, or the same diameter as the parts m2, n2, Fig. 7.

The invention is in nowise altered if a simple pump and compound liquid motor are employed. It is also immaterial to the invention whether it is employed on pumps or liquid motors of a single or compound type.

1. In liquid gears, the combination of a 1 casing having a bore for the gear pumps; a

pipe like sleeve removably placed in said bore; end covers placed 1n and supported by said sleeve; a shaft mounted 1n sald end ieces and movable um arts carried on sleeve; and movable pump parts supported by said end covers.

3. In liquid gears, the'combination of a casing; a pipe like sleeve in said casing; end covers supported by said sleeve; and movable pump parts supported by'xthe 'end covers. f

4. In liquid gears,the combination of a Whole adapted to be Withdrawn by means ofl the shaft.

5. In liquid gears, the combination of a casingl having a bore for the gear pumps; a pipe ike sleeve removably placed in said bore; end covers placed in and supported by said sleeve; a shaft mounted in said endpieces; movable pump parts carried on said shaft, 4and means engaging the extreme outer end of the end of the sleeve for holding'the same in place.

6. In liquid gears, the combination of a y casing having a bore forvthe gear pumps; a pipelike sleeve removably placed in said bore; end covers laced in and supported by said sleeve; a s i'aft mounted infsa-id end pieces; movable pump parts carried on said shaft, and means for holding said sleeve in place, said casing being free from external perforations between said end covers.

In testimony whereof, I have Signed my name to this specication in the presence of two subscribing Witnesses.

HUGO LENTZ.

I Witnesses:

JACOB KRAUS, A. O. TITTMANN. 

